论文标题
有机离子插入超导体（TMA）0.5FE2SE2的电化学合成和晶体结构，TC = 43 K
Electrochemical synthesis and crystal structure of the organic ion intercalated superconductor (TMA)0.5Fe2Se2 with Tc = 43 K
论文作者
论文摘要
有机阳离子在超导铁硒化铁中的插入可以显着提高临界温度（TC）。我们使用漂浮在汞阴极上的β-FESE晶体（TC〜8 K）提出了一种电化学方法，以定量地进行定量的四甲基铵离子（TMA+），以获得（TMA）0.5FE2SE2的大量样品，其TC = 43 K与分层晶体结构与THCR2SI2-SI2-SI2-typece+ IRS+ IR之间的差异很大相关。尽管有机离子无法通过X射线衍射检测到，但填充要求以及第一个原理DFT计算限制了指定的结构。我们的合成途径可以使其他有机阳离子具有高产量的电化学插入，从而极大地优化了超导性能，并扩展了这类高-TC材料。
Intercalation of organic cations in superconducting iron selenide can significantly increase the critical temperature (Tc). We present an electrochemical method using beta-FeSe crystals (Tc ~ 8 K) floating on a mercury cathode to intercalate tetramethylammonium ions (TMA+) quantitatively to obtain bulk samples of (TMA)0.5Fe2Se2 with Tc = 43 K. The layered crystal structure is closely related to the ThCr2Si2-type with disordered TMA+ ions between the FeSe layers. Although the organic ions are not detectable by X-ray diffraction, packing requirements as well as first principle DFT calculations constrain the specified structure. Our synthetic route enables electrochemical intercalations of other organic cations with high yields to greatly optimize the superconducting properties, and to expand this class of high-Tc materials.
